[llvm] [AMDGPU] Support bfloat comparison for ballot intrinsic (PR #165495)

[Jay Foad via llvm-commits]

================
@@ -7035,9 +7035,15 @@ static SDValue lowerBALLOTIntrinsic(const SITargetLowering &TLI, SDNode *N,
   SDLoc SL(N);
 
   if (Src.getOpcode() == ISD::SETCC) {
+    SDValue Op0 = Src.getOperand(0);
+    SDValue Op1 = Src.getOperand(1);
+    // Need to expand bfloat to float for comparison (setcc).
----------------
jayfoad wrote:

Surely generic legalization of ISD::SETCC should already promote bf16 to f32? And if that doesn't work because the ISD::SETCC hasn't been legalized yet, can't we just use the same generic machinery to promote bf16 AMDGPUISD::SETCC to f32?

https://github.com/llvm/llvm-project/pull/165495